DQ shif by: Satya Mohapatra, Mentor: Beverly Bereger, LHO fellow: Evan Goetz

• Average bns range over the 3 days: 65 Mpc. Noisy periods the range was dropped to 60 Mpc. Most dropped range tend to be due to passing trucks or other seismic sources.
• Average duty cycle = (93 + 73 + 34)/3. = 66 %
• airplane gltich at 0:58 UTC on 28th, (1174697431).
• Loudest events by PyCBC , short and medium duration templates on 27 and 28, and medium duration on, 29 are blip glitches.
• On 29 most glitches before 4 UTC line up with ETMX oplev yaw glitches (round 2 hveto winner).
• 3 pertinent aLOG during this dq shift:
  • On 29th March, data stretch at 11:10 UTC should be "flagged as garbage by DetChar?, from where bits 13 & 15 ("kappa_TST median" and "kappa_PU median") of the H1:GDS-CALIB_STATE_VECTOR are red during this observational stretch", due to OMC Alignment issues. Link.
  • Important study explaining, the real cause of "range increased by a couple of Mpc when the HVAC was shut down" or "Strong coupling of 8-18 Hz input beam tube vibration to the 70-200 Hz band of DARM." Link.
  • New combs in DARM since 14 March: link.

Details here: https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20170327